Manifold for internal-combustion engines



Dec, 30, 1924.

51,521,353 R. F. BRACKE MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed April 17, 1922 Patented Dec. 3G, i924.

NITE s'rAr ROBERT JF. BRACKE, F CHICAGO, ILLINOIS, ASSIGNOR. BY MESNE ASSIGNMENTS. TO CURTIS B. CAMP, TRUSTEE, OF OAK PARK, ILLINOIS.

Application filed Api-n 17, 1922. serial No. 554,180.`

To all 'whom t may concern.'

Be it known that I, ROBERT F. BRACKE, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Manifolds for Internal-Combustion Engines, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying drawing, forming a part of this specification.

My invent-ion relates to manifolds for internal combustion engines, and particularly to a single casting embodying both the intake and exhaust manifolds, and also an air passage for conducting the air to the carbureter.

A primary feature of my invent-ion is the provision of a manifold in which the passage for heating the air before it passes through the carbureter and that leading from the mixing chamber of the carbureter to the intake ports of the engine are both brought to a single surface upon which the carbureter may be attached, whereby through a single flange both the intake and discharge passages to and from the carbureter may be connected with the corresponding passages of the manifold.

Another feature of the invention resides in the particular method of associating the air passage Vwith the exhaust manifold so as to take advantage of radiation from the exhaust manifold in heating the air before it enters the carbureter.

My invention is illustrated in the accompanying drawing in which- Figure 1 is an elevation of the manifold, partly in section, to which a carbureter is shown attached;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a section on the line 3 3 of Figure 2, with the carbureter omitted; and

,Figure 4 is a section on the line/1 4 of Figure 1, illustrating the plan of the flange face.

In carrying out my invention, I prefer ably cast the manifold as a unit having an exhaust gas passage 5 communicating with the openings 6 for receiving its exhaust gases from the, engine cylinder block through the usual form of flange 7. rllhis exhaust passage discharges through an opening at 8 into the exhaust muffler, not shown.

- The fresh air intake passage 9 extends throughout the length of the manifold near the top thereof, and returns to substantially the central part of the manifold where it turns outwardly at 10, terminating in the opening 11 in flange 12. .This fresh air intake passage lies adjacent the exhaust passage throughout a large portion of its length', so that the air passing through it is heated. A screw-threaded plug 13 is provided in the forward end of this passage, so that it may be removed in hot weather to prevent overheating the air.

The manifold intake passage extends upwardly from the opening 11i in the flange 12, and branches through passages 15 to the flanged openings 1G, entrances to the engine block, not shown.

The carbureter 18 is provided with a U- shaped passage 19 in one limb of which a Venturi tube 20 is arranged about a nozzle 21. Duets 22, 23 and 24 are provided for the maintenance of a proper mixture for idling the engine. This carbureter is also provided with a choke throttle 25, and with the usual butterfly valve 2G for governing the flow of air to the engine.

By the use of my invention, the intake and discharge connections between a carbu reter and an engine manifold are completed through the same act as is ordinarily performed in connecting the discharge opening of the carbureter with the manifold. At the same time, flexible tubing, such as is often used for conducting warm air to the carbureter, is eliminated.

While I have shown and described my inventicn with respect to certain details of construction, it is to be understood that many modifications are possible without departing from the spirit or scope of the invention, and I therefore do not wish to be unduly limited to the specific embodiment herein illustrated.

l/Vhat I claim is:

1. Al manifold for internalcombustion engines comprising three distinct passageways, one for exhaust gases, one for carburetted air, and one for fresh air anterior to its Carburation, and a single flange to which the latter two passages lead for the connection of a carbureter thereto.

pipe and 2. A manifold for internal combustion engines comprising an exhaust gas passage eX- ftending throughout the length of themanifold, a fresh air passage leading from one end of the manifold to the other and then l back upon itself to substantially the central part of the manifold, a carburetted air passage, a flange Within which the latter two passages terminate, and a carbureter haiving a similar flange through which air is received from one of said passages and delivered to the other.

3. A manifold for internal combustion engines comprising 'an exhaust gas passage eX- tending throughout the entire length of the v manifold, an intake manifold in heat conductlng relation to said exhaust passage, a

fresh' air passage extending along the manifold from the discharge end of the exhaust passage to the other end of the; manifold and then backwardly to the center of themanifold, and a connection forming a part of said manifold for conducting the air from said fresh air passage to a carbureter.

4. A manifold for internalcombustion en'- gines comprising an exhaust gas passage ex- In witness whereof, I hereunto subscribe my name this 8th day of April, 1922.-

' ROBERT AF. BRACKE.

Witnesses:

EMILE J BOURGEOIS, DAGMAR PETERSON. 

